| //===-- ABISysV_s390x.cpp ---------------------------------------*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "ABISysV_s390x.h" |
| |
| // C Includes |
| // C++ Includes |
| // Other libraries and framework includes |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/Triple.h" |
| |
| // Project includes |
| #include "lldb/Core/Module.h" |
| #include "lldb/Core/PluginManager.h" |
| #include "lldb/Core/RegisterValue.h" |
| #include "lldb/Core/Value.h" |
| #include "lldb/Core/ValueObjectConstResult.h" |
| #include "lldb/Core/ValueObjectMemory.h" |
| #include "lldb/Core/ValueObjectRegister.h" |
| #include "lldb/Symbol/UnwindPlan.h" |
| #include "lldb/Target/Process.h" |
| #include "lldb/Target/RegisterContext.h" |
| #include "lldb/Target/StackFrame.h" |
| #include "lldb/Target/Target.h" |
| #include "lldb/Target/Thread.h" |
| #include "lldb/Utility/ConstString.h" |
| #include "lldb/Utility/DataExtractor.h" |
| #include "lldb/Utility/Log.h" |
| #include "lldb/Utility/Status.h" |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| enum dwarf_regnums { |
| // General Purpose Registers |
| dwarf_r0_s390x = 0, |
| dwarf_r1_s390x, |
| dwarf_r2_s390x, |
| dwarf_r3_s390x, |
| dwarf_r4_s390x, |
| dwarf_r5_s390x, |
| dwarf_r6_s390x, |
| dwarf_r7_s390x, |
| dwarf_r8_s390x, |
| dwarf_r9_s390x, |
| dwarf_r10_s390x, |
| dwarf_r11_s390x, |
| dwarf_r12_s390x, |
| dwarf_r13_s390x, |
| dwarf_r14_s390x, |
| dwarf_r15_s390x, |
| // Floating Point Registers / Vector Registers 0-15 |
| dwarf_f0_s390x = 16, |
| dwarf_f2_s390x, |
| dwarf_f4_s390x, |
| dwarf_f6_s390x, |
| dwarf_f1_s390x, |
| dwarf_f3_s390x, |
| dwarf_f5_s390x, |
| dwarf_f7_s390x, |
| dwarf_f8_s390x, |
| dwarf_f10_s390x, |
| dwarf_f12_s390x, |
| dwarf_f14_s390x, |
| dwarf_f9_s390x, |
| dwarf_f11_s390x, |
| dwarf_f13_s390x, |
| dwarf_f15_s390x, |
| // Access Registers |
| dwarf_acr0_s390x = 48, |
| dwarf_acr1_s390x, |
| dwarf_acr2_s390x, |
| dwarf_acr3_s390x, |
| dwarf_acr4_s390x, |
| dwarf_acr5_s390x, |
| dwarf_acr6_s390x, |
| dwarf_acr7_s390x, |
| dwarf_acr8_s390x, |
| dwarf_acr9_s390x, |
| dwarf_acr10_s390x, |
| dwarf_acr11_s390x, |
| dwarf_acr12_s390x, |
| dwarf_acr13_s390x, |
| dwarf_acr14_s390x, |
| dwarf_acr15_s390x, |
| // Program Status Word |
| dwarf_pswm_s390x = 64, |
| dwarf_pswa_s390x, |
| // Vector Registers 16-31 |
| dwarf_v16_s390x = 68, |
| dwarf_v18_s390x, |
| dwarf_v20_s390x, |
| dwarf_v22_s390x, |
| dwarf_v17_s390x, |
| dwarf_v19_s390x, |
| dwarf_v21_s390x, |
| dwarf_v23_s390x, |
| dwarf_v24_s390x, |
| dwarf_v26_s390x, |
| dwarf_v28_s390x, |
| dwarf_v30_s390x, |
| dwarf_v25_s390x, |
| dwarf_v27_s390x, |
| dwarf_v29_s390x, |
| dwarf_v31_s390x, |
| }; |
| |
| // RegisterKind: EHFrame, DWARF, Generic, Process Plugin, LLDB |
| |
| #define DEFINE_REG(name, size, alt, generic) \ |
| { \ |
| #name, alt, size, 0, eEncodingUint, eFormatHex, \ |
| {dwarf_##name##_s390x, dwarf_##name##_s390x, generic, \ |
| LLDB_INVALID_REGNUM, LLDB_INVALID_REGNUM }, \ |
| nullptr, nullptr, nullptr, 0 \ |
| } |
| |
| static RegisterInfo g_register_infos[] = { |
| DEFINE_REG(r0, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r1, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r2, 8, "arg1", LLDB_REGNUM_GENERIC_ARG1), |
| DEFINE_REG(r3, 8, "arg2", LLDB_REGNUM_GENERIC_ARG2), |
| DEFINE_REG(r4, 8, "arg3", LLDB_REGNUM_GENERIC_ARG3), |
| DEFINE_REG(r5, 8, "arg4", LLDB_REGNUM_GENERIC_ARG4), |
| DEFINE_REG(r6, 8, "arg5", LLDB_REGNUM_GENERIC_ARG5), |
| DEFINE_REG(r7, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r8, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r9, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r10, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r11, 8, "fp", LLDB_REGNUM_GENERIC_FP), |
| DEFINE_REG(r12, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r13, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r14, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(r15, 8, "sp", LLDB_REGNUM_GENERIC_SP), |
| DEFINE_REG(acr0, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr1, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr2, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr3, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr4, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr5, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr6, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr7, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr8, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr9, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr10, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr11, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr12, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr13, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr14, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(acr15, 4, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(pswm, 8, "flags", LLDB_REGNUM_GENERIC_FLAGS), |
| DEFINE_REG(pswa, 8, "pc", LLDB_REGNUM_GENERIC_PC), |
| DEFINE_REG(f0, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f1, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f2, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f3, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f4, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f5, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f6, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f7, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f8, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f9, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f10, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f11, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f12, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f13, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f14, 8, nullptr, LLDB_INVALID_REGNUM), |
| DEFINE_REG(f15, 8, nullptr, LLDB_INVALID_REGNUM), |
| }; |
| |
| static const uint32_t k_num_register_infos = |
| llvm::array_lengthof(g_register_infos); |
| static bool g_register_info_names_constified = false; |
| |
| const lldb_private::RegisterInfo * |
| ABISysV_s390x::GetRegisterInfoArray(uint32_t &count) { |
| // Make the C-string names and alt_names for the register infos into const |
| // C-string values by having the ConstString unique the names in the global |
| // constant C-string pool. |
| if (!g_register_info_names_constified) { |
| g_register_info_names_constified = true; |
| for (uint32_t i = 0; i < k_num_register_infos; ++i) { |
| if (g_register_infos[i].name) |
| g_register_infos[i].name = |
| ConstString(g_register_infos[i].name).GetCString(); |
| if (g_register_infos[i].alt_name) |
| g_register_infos[i].alt_name = |
| ConstString(g_register_infos[i].alt_name).GetCString(); |
| } |
| } |
| count = k_num_register_infos; |
| return g_register_infos; |
| } |
| |
| size_t ABISysV_s390x::GetRedZoneSize() const { return 0; } |
| |
| //------------------------------------------------------------------ |
| // Static Functions |
| //------------------------------------------------------------------ |
| |
| ABISP |
| ABISysV_s390x::CreateInstance(lldb::ProcessSP process_sp, const ArchSpec &arch) { |
| static ABISP g_abi_sp; |
| if (arch.GetTriple().getArch() == llvm::Triple::systemz) { |
| if (!g_abi_sp) |
| g_abi_sp.reset(new ABISysV_s390x(process_sp)); |
| return g_abi_sp; |
| } |
| return ABISP(); |
| } |
| |
| bool ABISysV_s390x::PrepareTrivialCall(Thread &thread, addr_t sp, |
| addr_t func_addr, addr_t return_addr, |
| llvm::ArrayRef<addr_t> args) const { |
| Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS)); |
| |
| if (log) { |
| StreamString s; |
| s.Printf("ABISysV_s390x::PrepareTrivialCall (tid = 0x%" PRIx64 |
| ", sp = 0x%" PRIx64 ", func_addr = 0x%" PRIx64 |
| ", return_addr = 0x%" PRIx64, |
| thread.GetID(), (uint64_t)sp, (uint64_t)func_addr, |
| (uint64_t)return_addr); |
| |
| for (size_t i = 0; i < args.size(); ++i) |
| s.Printf(", arg%" PRIu64 " = 0x%" PRIx64, static_cast<uint64_t>(i + 1), |
| args[i]); |
| s.PutCString(")"); |
| log->PutString(s.GetString()); |
| } |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| if (!reg_ctx) |
| return false; |
| |
| const RegisterInfo *pc_reg_info = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC); |
| const RegisterInfo *sp_reg_info = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_SP); |
| const RegisterInfo *ra_reg_info = reg_ctx->GetRegisterInfoByName("r14", 0); |
| ProcessSP process_sp(thread.GetProcess()); |
| |
| // Allocate a new stack frame and space for stack arguments if necessary |
| |
| addr_t arg_pos = 0; |
| if (args.size() > 5) { |
| sp -= 8 * (args.size() - 5); |
| arg_pos = sp; |
| } |
| |
| sp -= 160; |
| |
| // Process arguments |
| |
| for (size_t i = 0; i < args.size(); ++i) { |
| if (i < 5) { |
| const RegisterInfo *reg_info = reg_ctx->GetRegisterInfo( |
| eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1 + i); |
| if (log) |
| log->Printf("About to write arg%" PRIu64 " (0x%" PRIx64 ") into %s", |
| static_cast<uint64_t>(i + 1), args[i], reg_info->name); |
| if (!reg_ctx->WriteRegisterFromUnsigned(reg_info, args[i])) |
| return false; |
| } else { |
| Status error; |
| if (log) |
| log->Printf("About to write arg%" PRIu64 " (0x%" PRIx64 ") onto stack", |
| static_cast<uint64_t>(i + 1), args[i]); |
| if (!process_sp->WritePointerToMemory(arg_pos, args[i], error)) |
| return false; |
| arg_pos += 8; |
| } |
| } |
| |
| // %r14 is set to the return address |
| |
| if (log) |
| log->Printf("Writing RA: 0x%" PRIx64, (uint64_t)return_addr); |
| |
| if (!reg_ctx->WriteRegisterFromUnsigned(ra_reg_info, return_addr)) |
| return false; |
| |
| // %r15 is set to the actual stack value. |
| |
| if (log) |
| log->Printf("Writing SP: 0x%" PRIx64, (uint64_t)sp); |
| |
| if (!reg_ctx->WriteRegisterFromUnsigned(sp_reg_info, sp)) |
| return false; |
| |
| // %pc is set to the address of the called function. |
| |
| if (log) |
| log->Printf("Writing PC: 0x%" PRIx64, (uint64_t)func_addr); |
| |
| if (!reg_ctx->WriteRegisterFromUnsigned(pc_reg_info, func_addr)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool ReadIntegerArgument(Scalar &scalar, unsigned int bit_width, |
| bool is_signed, Thread &thread, |
| uint32_t *argument_register_ids, |
| unsigned int ¤t_argument_register, |
| addr_t ¤t_stack_argument) { |
| if (bit_width > 64) |
| return false; // Scalar can't hold large integer arguments |
| |
| if (current_argument_register < 5) { |
| scalar = thread.GetRegisterContext()->ReadRegisterAsUnsigned( |
| argument_register_ids[current_argument_register], 0); |
| current_argument_register++; |
| if (is_signed) |
| scalar.SignExtend(bit_width); |
| } else { |
| uint32_t byte_size = (bit_width + (8 - 1)) / 8; |
| Status error; |
| if (thread.GetProcess()->ReadScalarIntegerFromMemory( |
| current_stack_argument + 8 - byte_size, byte_size, is_signed, |
| scalar, error)) { |
| current_stack_argument += 8; |
| return true; |
| } |
| return false; |
| } |
| return true; |
| } |
| |
| bool ABISysV_s390x::GetArgumentValues(Thread &thread, ValueList &values) const { |
| unsigned int num_values = values.GetSize(); |
| unsigned int value_index; |
| |
| // Extract the register context so we can read arguments from registers |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| |
| if (!reg_ctx) |
| return false; |
| |
| // Get the pointer to the first stack argument so we have a place to start |
| // when reading data |
| |
| addr_t sp = reg_ctx->GetSP(0); |
| |
| if (!sp) |
| return false; |
| |
| addr_t current_stack_argument = sp + 160; |
| |
| uint32_t argument_register_ids[5]; |
| |
| argument_register_ids[0] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG1) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[1] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG2) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[2] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG3) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[3] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG4) |
| ->kinds[eRegisterKindLLDB]; |
| argument_register_ids[4] = |
| reg_ctx->GetRegisterInfo(eRegisterKindGeneric, LLDB_REGNUM_GENERIC_ARG5) |
| ->kinds[eRegisterKindLLDB]; |
| |
| unsigned int current_argument_register = 0; |
| |
| for (value_index = 0; value_index < num_values; ++value_index) { |
| Value *value = values.GetValueAtIndex(value_index); |
| |
| if (!value) |
| return false; |
| |
| // We currently only support extracting values with Clang QualTypes. Do we |
| // care about others? |
| CompilerType compiler_type = value->GetCompilerType(); |
| if (!compiler_type) |
| return false; |
| bool is_signed; |
| |
| if (compiler_type.IsIntegerOrEnumerationType(is_signed)) { |
| ReadIntegerArgument(value->GetScalar(), compiler_type.GetBitSize(&thread), |
| is_signed, thread, argument_register_ids, |
| current_argument_register, current_stack_argument); |
| } else if (compiler_type.IsPointerType()) { |
| ReadIntegerArgument(value->GetScalar(), compiler_type.GetBitSize(&thread), |
| false, thread, argument_register_ids, |
| current_argument_register, current_stack_argument); |
| } |
| } |
| |
| return true; |
| } |
| |
| Status ABISysV_s390x::SetReturnValueObject(lldb::StackFrameSP &frame_sp, |
| lldb::ValueObjectSP &new_value_sp) { |
| Status error; |
| if (!new_value_sp) { |
| error.SetErrorString("Empty value object for return value."); |
| return error; |
| } |
| |
| CompilerType compiler_type = new_value_sp->GetCompilerType(); |
| if (!compiler_type) { |
| error.SetErrorString("Null clang type for return value."); |
| return error; |
| } |
| |
| Thread *thread = frame_sp->GetThread().get(); |
| |
| bool is_signed; |
| uint32_t count; |
| bool is_complex; |
| |
| RegisterContext *reg_ctx = thread->GetRegisterContext().get(); |
| |
| bool set_it_simple = false; |
| if (compiler_type.IsIntegerOrEnumerationType(is_signed) || |
| compiler_type.IsPointerType()) { |
| const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName("r2", 0); |
| |
| DataExtractor data; |
| Status data_error; |
| size_t num_bytes = new_value_sp->GetData(data, data_error); |
| if (data_error.Fail()) { |
| error.SetErrorStringWithFormat( |
| "Couldn't convert return value to raw data: %s", |
| data_error.AsCString()); |
| return error; |
| } |
| lldb::offset_t offset = 0; |
| if (num_bytes <= 8) { |
| uint64_t raw_value = data.GetMaxU64(&offset, num_bytes); |
| |
| if (reg_ctx->WriteRegisterFromUnsigned(reg_info, raw_value)) |
| set_it_simple = true; |
| } else { |
| error.SetErrorString("We don't support returning longer than 64 bit " |
| "integer values at present."); |
| } |
| } else if (compiler_type.IsFloatingPointType(count, is_complex)) { |
| if (is_complex) |
| error.SetErrorString( |
| "We don't support returning complex values at present"); |
| else { |
| size_t bit_width = compiler_type.GetBitSize(frame_sp.get()); |
| if (bit_width <= 64) { |
| const RegisterInfo *f0_info = reg_ctx->GetRegisterInfoByName("f0", 0); |
| RegisterValue f0_value; |
| DataExtractor data; |
| Status data_error; |
| size_t num_bytes = new_value_sp->GetData(data, data_error); |
| if (data_error.Fail()) { |
| error.SetErrorStringWithFormat( |
| "Couldn't convert return value to raw data: %s", |
| data_error.AsCString()); |
| return error; |
| } |
| |
| unsigned char buffer[8]; |
| ByteOrder byte_order = data.GetByteOrder(); |
| |
| data.CopyByteOrderedData(0, num_bytes, buffer, 8, byte_order); |
| f0_value.SetBytes(buffer, 8, byte_order); |
| reg_ctx->WriteRegister(f0_info, f0_value); |
| set_it_simple = true; |
| } else { |
| // FIXME - don't know how to do long doubles yet. |
| error.SetErrorString( |
| "We don't support returning float values > 64 bits at present"); |
| } |
| } |
| } |
| |
| if (!set_it_simple) { |
| // Okay we've got a structure or something that doesn't fit in a simple |
| // register. We should figure out where it really goes, but we don't |
| // support this yet. |
| error.SetErrorString("We only support setting simple integer and float " |
| "return types at present."); |
| } |
| |
| return error; |
| } |
| |
| ValueObjectSP ABISysV_s390x::GetReturnValueObjectSimple( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| ValueObjectSP return_valobj_sp; |
| Value value; |
| |
| if (!return_compiler_type) |
| return return_valobj_sp; |
| |
| // value.SetContext (Value::eContextTypeClangType, return_value_type); |
| value.SetCompilerType(return_compiler_type); |
| |
| RegisterContext *reg_ctx = thread.GetRegisterContext().get(); |
| if (!reg_ctx) |
| return return_valobj_sp; |
| |
| const uint32_t type_flags = return_compiler_type.GetTypeInfo(); |
| if (type_flags & eTypeIsScalar) { |
| value.SetValueType(Value::eValueTypeScalar); |
| |
| bool success = false; |
| if (type_flags & eTypeIsInteger) { |
| // Extract the register context so we can read arguments from registers |
| |
| const size_t byte_size = return_compiler_type.GetByteSize(nullptr); |
| uint64_t raw_value = thread.GetRegisterContext()->ReadRegisterAsUnsigned( |
| reg_ctx->GetRegisterInfoByName("r2", 0), 0); |
| const bool is_signed = (type_flags & eTypeIsSigned) != 0; |
| switch (byte_size) { |
| default: |
| break; |
| |
| case sizeof(uint64_t): |
| if (is_signed) |
| value.GetScalar() = (int64_t)(raw_value); |
| else |
| value.GetScalar() = (uint64_t)(raw_value); |
| success = true; |
| break; |
| |
| case sizeof(uint32_t): |
| if (is_signed) |
| value.GetScalar() = (int32_t)(raw_value & UINT32_MAX); |
| else |
| value.GetScalar() = (uint32_t)(raw_value & UINT32_MAX); |
| success = true; |
| break; |
| |
| case sizeof(uint16_t): |
| if (is_signed) |
| value.GetScalar() = (int16_t)(raw_value & UINT16_MAX); |
| else |
| value.GetScalar() = (uint16_t)(raw_value & UINT16_MAX); |
| success = true; |
| break; |
| |
| case sizeof(uint8_t): |
| if (is_signed) |
| value.GetScalar() = (int8_t)(raw_value & UINT8_MAX); |
| else |
| value.GetScalar() = (uint8_t)(raw_value & UINT8_MAX); |
| success = true; |
| break; |
| } |
| } else if (type_flags & eTypeIsFloat) { |
| if (type_flags & eTypeIsComplex) { |
| // Don't handle complex yet. |
| } else { |
| const size_t byte_size = return_compiler_type.GetByteSize(nullptr); |
| if (byte_size <= sizeof(long double)) { |
| const RegisterInfo *f0_info = reg_ctx->GetRegisterInfoByName("f0", 0); |
| RegisterValue f0_value; |
| if (reg_ctx->ReadRegister(f0_info, f0_value)) { |
| DataExtractor data; |
| if (f0_value.GetData(data)) { |
| lldb::offset_t offset = 0; |
| if (byte_size == sizeof(float)) { |
| value.GetScalar() = (float)data.GetFloat(&offset); |
| success = true; |
| } else if (byte_size == sizeof(double)) { |
| value.GetScalar() = (double)data.GetDouble(&offset); |
| success = true; |
| } else if (byte_size == sizeof(long double)) { |
| // Don't handle long double yet. |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| if (success) |
| return_valobj_sp = ValueObjectConstResult::Create( |
| thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); |
| } else if (type_flags & eTypeIsPointer) { |
| unsigned r2_id = |
| reg_ctx->GetRegisterInfoByName("r2", 0)->kinds[eRegisterKindLLDB]; |
| value.GetScalar() = |
| (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r2_id, 0); |
| value.SetValueType(Value::eValueTypeScalar); |
| return_valobj_sp = ValueObjectConstResult::Create( |
| thread.GetStackFrameAtIndex(0).get(), value, ConstString("")); |
| } |
| |
| return return_valobj_sp; |
| } |
| |
| ValueObjectSP ABISysV_s390x::GetReturnValueObjectImpl( |
| Thread &thread, CompilerType &return_compiler_type) const { |
| ValueObjectSP return_valobj_sp; |
| |
| if (!return_compiler_type) |
| return return_valobj_sp; |
| |
| ExecutionContext exe_ctx(thread.shared_from_this()); |
| return_valobj_sp = GetReturnValueObjectSimple(thread, return_compiler_type); |
| if (return_valobj_sp) |
| return return_valobj_sp; |
| |
| RegisterContextSP reg_ctx_sp = thread.GetRegisterContext(); |
| if (!reg_ctx_sp) |
| return return_valobj_sp; |
| |
| if (return_compiler_type.IsAggregateType()) { |
| // FIXME: This is just taking a guess, r2 may very well no longer hold the |
| // return storage location. |
| // If we are going to do this right, when we make a new frame we should |
| // check to see if it uses a memory return, and if we are at the first |
| // instruction and if so stash away the return location. Then we would |
| // only return the memory return value if we know it is valid. |
| |
| unsigned r2_id = |
| reg_ctx_sp->GetRegisterInfoByName("r2", 0)->kinds[eRegisterKindLLDB]; |
| lldb::addr_t storage_addr = |
| (uint64_t)thread.GetRegisterContext()->ReadRegisterAsUnsigned(r2_id, 0); |
| return_valobj_sp = ValueObjectMemory::Create( |
| &thread, "", Address(storage_addr, nullptr), return_compiler_type); |
| } |
| |
| return return_valobj_sp; |
| } |
| |
| bool ABISysV_s390x::CreateFunctionEntryUnwindPlan(UnwindPlan &unwind_plan) { |
| unwind_plan.Clear(); |
| unwind_plan.SetRegisterKind(eRegisterKindDWARF); |
| |
| UnwindPlan::RowSP row(new UnwindPlan::Row); |
| |
| // Our Call Frame Address is the stack pointer value + 160 |
| row->GetCFAValue().SetIsRegisterPlusOffset(dwarf_r15_s390x, 160); |
| |
| // The previous PC is in r14 |
| row->SetRegisterLocationToRegister(dwarf_pswa_s390x, dwarf_r14_s390x, true); |
| |
| // All other registers are the same. |
| unwind_plan.AppendRow(row); |
| unwind_plan.SetSourceName("s390x at-func-entry default"); |
| unwind_plan.SetSourcedFromCompiler(eLazyBoolNo); |
| return true; |
| } |
| |
| bool ABISysV_s390x::CreateDefaultUnwindPlan(UnwindPlan &unwind_plan) { |
| // There's really no default way to unwind on s390x. Trust the .eh_frame CFI, |
| // which should always be good. |
| return false; |
| } |
| |
| bool ABISysV_s390x::GetFallbackRegisterLocation( |
| const RegisterInfo *reg_info, |
| UnwindPlan::Row::RegisterLocation &unwind_regloc) { |
| // If a volatile register is being requested, we don't want to forward the |
| // next frame's register contents up the stack -- the register is not |
| // retrievable at this frame. |
| if (RegisterIsVolatile(reg_info)) { |
| unwind_regloc.SetUndefined(); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool ABISysV_s390x::RegisterIsVolatile(const RegisterInfo *reg_info) { |
| return !RegisterIsCalleeSaved(reg_info); |
| } |
| |
| bool ABISysV_s390x::RegisterIsCalleeSaved(const RegisterInfo *reg_info) { |
| if (reg_info) { |
| // Preserved registers are : |
| // r6-r13, r15 |
| // f8-f15 |
| |
| const char *name = reg_info->name; |
| if (name[0] == 'r') { |
| switch (name[1]) { |
| case '6': // r6 |
| case '7': // r7 |
| case '8': // r8 |
| case '9': // r9 |
| return name[2] == '\0'; |
| |
| case '1': // r10, r11, r12, r13, r15 |
| if ((name[2] >= '0' && name[2] <= '3') || name[2] == '5') |
| return name[3] == '\0'; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| if (name[0] == 'f') { |
| switch (name[1]) { |
| case '8': // r8 |
| case '9': // r9 |
| return name[2] == '\0'; |
| |
| case '1': // r10, r11, r12, r13, r14, r15 |
| if (name[2] >= '0' && name[2] <= '5') |
| return name[3] == '\0'; |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| // Accept shorter-variant versions |
| if (name[0] == 's' && name[1] == 'p' && name[2] == '\0') // sp |
| return true; |
| if (name[0] == 'f' && name[1] == 'p' && name[2] == '\0') // fp |
| return true; |
| if (name[0] == 'p' && name[1] == 'c' && name[2] == '\0') // pc |
| return true; |
| } |
| return false; |
| } |
| |
| void ABISysV_s390x::Initialize() { |
| PluginManager::RegisterPlugin( |
| GetPluginNameStatic(), "System V ABI for s390x targets", CreateInstance); |
| } |
| |
| void ABISysV_s390x::Terminate() { |
| PluginManager::UnregisterPlugin(CreateInstance); |
| } |
| |
| lldb_private::ConstString ABISysV_s390x::GetPluginNameStatic() { |
| static ConstString g_name("sysv-s390x"); |
| return g_name; |
| } |
| |
| //------------------------------------------------------------------ |
| // PluginInterface protocol |
| //------------------------------------------------------------------ |
| |
| lldb_private::ConstString ABISysV_s390x::GetPluginName() { |
| return GetPluginNameStatic(); |
| } |
| |
| uint32_t ABISysV_s390x::GetPluginVersion() { return 1; } |
